In this guide
Bottom line: Polymarket remains technically available to UK-based traders but exists within an uncertain regulatory framework. British residents can access it through cryptocurrency wallets without geographic restrictions. Regarding taxation: profits are probably liable to Income Tax (20–45%) or CGT (18–24%). PolyGram delivers a UK-tailored platform interface connected to the same Polymarket order book.
Polymarket functions as a UK prediction market venue in a rather complex legal landscape. The UK Gambling Commission (UKGC) has neither formally authorised nor explicitly outlawed Polymarket. Because it functions through crypto wallets and decentralised blockchain mechanisms rather than conventional sterling accounts, it circumvents the regulatory structures that apply to established operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nevertheless, it remains unprohibited for UK-based participants. The principal regulatory considerations are:
- Absence of geographic restrictions on UK connections — in contrast to American users who face blocking
- No GBP transactions — Polymarket exclusively processes USDC on Polygon, which is a digital asset rather than a licensed payment mechanism under the Gambling Act 2005
- FCA approach: Digital assets fall under the Financial Services and Markets Act 2023, though prediction market instruments receive no explicit treatment
- UKGC guidance: No published statement specifically addressing Polymarket as of May 2026
Practically speaking: Since Polymarket's 2020 inception, UK participants have enjoyed uninterrupted service, and no cases of regulatory action against individual UK traders have surfaced.
Depositing into Polymarket from the UK
Accessible deposit pathways for UK customers via PolyGram:
- Kraken UK: BACS / Faster Payments → acquire USDC → transfer to Polygon address (~10 min)
- Coinbase UK: Bank transfer or card payment → USDC → transfer to Polygon
- PolyGram direct: Visa or Mastercard debit → USDC arrives instantly in your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market profits is structured as follows:
- Where activity is infrequent (non-professional): Profits might qualify as gambling returns — no tax liability under prevailing HMRC rules for betting and gambling gains
- Where activity is frequent/professional: HMRC may treat it as a business activity — liable to Income Tax (20–45%)
- Alternatively, if classified as digital asset holdings: Capital Gains Tax (18–24%) applies when USDC is sold above the annual CGT exemption (£3,000 in 2026)
Taxation remains genuinely uncertain. Numerous UK Polymarket participants handle their profits using crypto CGT methodology and employ platforms such as Koinly or CoinTracker to produce HMRC-acceptable documentation.
UK-Relevant Markets on Polymarket
- UK General Election: Following the 2024 election, the subsequent general election is scheduled for 2029. Available markets cover by-elections, polling data, and party leadership contests
- Premier League: Championship winner, bottom-three finishers, and top-four qualification markets throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — each with substantial CL trading activity
- World Cup 2026: England tournament victory market priced between 13–15%
- Bank of England: Base rate forecast markets for every MPC decision
Polymarket vs UK Alternatives
| Platform | UK Access | Regulated | House Edge | Markets |
|---|---|---|---|---|
| Polymarket (via PolyGram) | ✅ Full | Grey zone | ~1% | 8,400+ |
| Betfair Exchange | ✅ Full | UKGC | 5% | ~500 |
| Smarkets | ✅ Full | UKGC | 2% | ~200 |
| Kalshi | ❌ US only | CFTC (US) | ~1% | ~500 |
| Metaculus | ✅ Full | None | N/A (no money) | 5,000+ |
Access UK prediction markets via PolyGram →
FAQ — Polymarket UK
- Do I need to declare Polymarket winnings to HMRC?
- HMRC mandates reporting of all taxable revenue. The question of whether Polymarket profits are taxable hinges on how frequently you trade and how HMRC categorises your activity. Occasional users might benefit from the gambling exemption; active traders will almost certainly owe Income Tax or CGT. Seek guidance from a qualified UK tax professional regarding your circumstances.
- Can I withdraw to a UK bank account?
- Direct withdrawal is unavailable. USDC requires conversion to pounds sterling through a UK-authorised crypto platform (Kraken, Coinbase) before depositing to your bank. Processing typically requires 1–3 working days via standard Faster Payments.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC oversight and incorporates FSCS safeguards. Polymarket operates on-chain: assets sit in smart contracts rather than with a centralised operator — eliminating single points of vulnerability, yet offering no FSCS or UKGC recourse if problems materialise.